I use a pair of Etymotic Research ER4XR ear buds with the QO and they sound fantastic. The ER4XRs are really small reference quality ear buds, as I don’t really dig over-ear devices, but they have to be worn deep in your ears to get true bass response. Basically, you need to put them in like ear plugs, which some people don’t dig, but I find them incredibly comfortable, tiny, and sound amazing with just about any source, the QO definitely included.
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